linux-ext4 - Re: [PATCH 4/5] ext4: fallocate support in ext4

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Message-ID: <463FB008.3080706@garzik.org>
Date:	Mon, 07 May 2007 19:02:32 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org, xfs@....sgi.com, suparna@...ibm.com,
	cmm@...ibm.com
Subject: Re: [PATCH 4/5] ext4: fallocate support in ext4

Andreas Dilger wrote:
> On May 07, 2007  13:58 -0700, Andrew Morton wrote:
>> Final point: it's fairly disappointing that the present implementation is
>> ext4-only, and extent-only.  I do think we should be aiming at an ext4
>> bitmap-based implementation and an ext3 implementation.
> 
> Actually, this is a non-issue.  The reason that it is handled for extent-only
> is that this is the only way to allocate space in the filesystem without
> doing the explicit zeroing.  For other filesystems (including ext3 and

Precisely /how/ do you avoid the zeroing issue, for extents?

If I posix_fallocate() 20GB on ext4, it damn well better be zeroed, 
otherwise the implementation is broken.

	Jeff


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